Vertical Distribution Characteristics of Microplastics in Miyun Reservoir
Abstract
There are sparse reports on the vertical distribution characteristics of microplastics in drinking water sources with large water depths. To elucidate the vertical distribution characteristics of microplastics in the water of Miyun Reservoir， an important surface drinking water source in Beijing， a sampling campaign was conducted for surface， intermediate， and bottom water at different sites in both the flood and non-flood seasons. The abundance， morphology， and compositional characteristics of microplastics were investigated， and the spatial and temporal heterogeneity of microplastics was analyzed. The results showed that the abundance of microplastics in the water of Miyun Reservoir ranged from 0.4 to 7.6 n·L-1， with an average abundance of （2.7±1.6） n·L-1. The average abundance of microplastics in the Chaohe River reservoir area was higher than that in the Baihe River reservoir area. At the Baihe River inlet， microplastic abundance in the intermediate and bottom water layers was significantly higher than that in the surface water layer， whereas the Chaohe River inlet exhibited the highest abundance in the surface layer. Microplastic abundance was significantly higher during the flood season. Microplastic particles in the non-flood season were larger， more colorful， and comprised higher proportions of fibers and debris than those in the flood season. Vertically， fibers dominated all water layers， aggregating mainly in the surface and bottom water layers during flood season…
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